Gas-phase SO in absorption towards massive protostarsJ. V. Keane, A. M. S. Boonman, A. G. G. M. Tielens and E. F. van DishoeckA&A, 376 1 (2001) L5-L8DOI: https://doi.org/10.1051/0004-6361:20011008
in absorption towards massive protostars in absorption towards massive protostars